Thermostatic valve.



No. 836,636. PATENTED Nov. 20, 1906.

J. H. DAVIS. THERMO-STATI@ VALVE.

APPLICATION FILED MARHZE).1904. v

` 2 SHEETSSHEET 1 MW@ By v PTENTED NOV. 20, 1906. y J. H. DAVIS. THBRMOSTAT'IG VALVE. APPLGATloN-HLED M AR.29,1904. z'sHBBTs-SHEBT 2 Mmmmlllnnm N'rnn s'rATns Aralar ritienl JAMES H. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN ENGINEERING SPECIALTY CO., OF CHICAGO, ILLINOIS, AA COR- .'PORA'IION OF ILLINOIS.

'THEMosTATsC VALVE.

ically o ening and closing a valve dependent upon t e temperature of the iiuid flowing through the same. The objects of. the invention are, to 4provide such a valve with increased sensibility to the changes of heat in the assing fluid to provide a .valve in which boti the valve seat and the valve proper move under the iniluence of the increased heat 5 to provide a superior form of ,valve hav- `ing compensating means allowing yielding of the valve on its stem after seating; to make a more accurate and positive operating valve for the purpose, and to generally; improve the structure and operation of thermostatic valves. These objects, together 'with other advantaves which will hereinafter appear, I attain by means of theconstruction' illustrated in preferred form in the accompanying drawings, wherein- Figure l is a vertical section through one form of my improved thermostatic valve, showing the valve open Figure 2 is a horizontal section on the line 2, 2, of Figure 1,

Figures 3 and 4 are respectively a top plan and a side elevation, of a form of spring to allow yielding of the valve as it is pressed to its seat 5 Figure 5 is a vertical central section through amodiiied form in which the valve is outside of (the tubular casing carrying the valve seat, an

Figure 6 is a horizontal section on line 6, 6,

of Figure 5.

In the structure as illustrated in Figures 1 to 4, it will be seen that I `have provided a casing 7 which is attached to the steam pipe 8 and carries an upwardly extending cylinder which is closed by a screwcap 10, and sup- -ports the lscrew adjusted head 11 carrying the valve stem 12. The stem 12 has at its bottom a head 13 and an elongated shank extended downward therefromwhich is surrounded by the valve disk 14 and the head and the valve proper are separated by a Specification of Letterslatent. Appumionmed March 29, 1904, serial No. 200.653.

Patented Nov. 20, 1906.

spring 15 which in preferred form is shown more clearly in Figures 3 and 43 This spring is preferably made of a disk with spurs 15a punched out and projecting below as shown in Figure 4, making aspring which bears upon the valve at several independent points.

The valve proper, 14, is surrounded by a.

valve seatr 16 formed in the lower end of a tubular support 17, and this tube at its top has an annular flange 18 resting uponthe cylinder 19, this latter being supported upon a series of lugs 20 madeintegral with the outside casing 9 as appears in Figure l. I prefer to make the casing 9 and tube 17 of iron, while the valve stem 12 and the supporting cylinder 19 are of brass. A

It will be seen from this construction that when the steam enters the chamber so as to act upon the various parts thereof, when the temperature rises too high the expansion of the long valve stem 12 downward w1ll press ment and a quick action, the valve and seat moving toward each other to close the valve. After the valve has come in contact with its seat further movement of the parts toward each other may be compensated for by the yielding of the spring 15v between the valve and the head 18. On the otherthand, by the cooling of the devices the reverse action takes place, that is the contraction of the stem 12 and the cylinder 19 cause the valve and its seat to move awa from each other, opening the valve and a mitting the steam again. The action is the same whether the steam flows through the parts as illustrated in Figure 1 or in the inverse direction as in Figure 5.

In Figure 5 -Ihave illustrated a-modi-flcation in which the valve is outside the tube carrying the valve seat. In this case the cylinder 19a rests upon the lugs20 carried in the brass casing 9 and supports the head 18 of the brass valve seat tube 17. The valve seat in this case is on the outer end of the tube and the iron valve stem 12 extends through thetube and carries on its lower end the valve 14 supportedupon the stem with spring 15 by means of the -nut 13 as will be apparent roo from Figure 5. In this instance it will be.

seen that the expansion of the cylinder 17 downward will move the valve seat ltoward the valve at the same time that the expansion of'the louter casing 9 upward will by means of the head 11 lift the valve stem 12 and .draw the valve 14 toward its seat, thus again making a double movement of the valve and seat and giving superior sensibility and rapidity of action.

It will be noted that b the valve proper being carried upon an a justable head the distancejoi the valve `from its seat may be regulatedas desired, It will be understood di courseth'at a coil or any other'iorm oi springmaybe used instead of the peculiar 1 springfl''which I'have -used herein, but I rel gard "this as superior'for thepurposes as .it engages thevalfve at three points of contact and keepsiit 'adjusted properly to iit its seat, i while at'the same timel a spring of very great l resistance 'may lbe provided 'n very small l space.' Other advantages of the device will Y readily oecurtothose familiar'with the art.

l T'li-Iaving'thus described' my invention and illustrated' its-use, what I claimfas new, and

desire to secure by Letters'Iate-nt, is the l'ollowing: V l

1. In.a thermostatic valve, the combina- 1 -tion of'a closed casing'provided with aninlet andan outlet and composed of a material having va low co'efiicientof expansion, a valve suspended therein having a stem composed of a material having'a high coefficient of eac parisien-attached to the'top oi' the casing and controllingtheinlet tothe casing, and 'a tube composed-'oi' a material having a low coefficient of expansion having therein a valve l seat, mounted upon'a supporting tube of materialhaving a high coefficient of eXpansion Asaid supporting tube being supported by pansiomand a valve on the stem, a support- 'ing tube in the casing of a .material having a o'a material having a high coefficient ofexthe easing, whereby the valve and' seat move .after the valve hasl met its seat, substantially as described.

3. In a thermostatic valve, a'casing provided with a series of projecting lugs, in com- I A6o bination witha loose supporting cylinder of a material having a high coefficient of ex-l pansion resting upon said lugs, a tube of a material having a low coeflicient of expansion suspended therein and supporting the valve seat, and a valve to cooperate there# with. 7

4. The combination in a thermostatic valve, oi a casing provided interiorly with a series of lugs, a valve stem of a material having a high coeflicient expansion adjustablyl mounted therein, a cylinder: of a material having a'high coeflicient ol expansion supported on the said lugs and a tube of a maf terialhaving a'low coeiicient oi' expansion carrying a valve seat and supported upon saidfcylinderl e 5. In a thermostatic`valve,'the combination of an iron casing carryingtherein a brass valve stem, and'provided with a series of supporting-lugs, a brass expansion ,ring seated upon said lugs, and an iron tube carrying a valve seat resting upon said expansion'ring.

6. In a thermostatic valve, the combina-v tion with a valve casing and an extended eX-.

pansion casinghaving a screw cap thereon, of a tube supported at its top adjacent'the cap carrying a valve seat at its base,and a stem in the tube carrying a valve, all parts mounted in said casing, and removable through the cap of the casing, substantially as de'scribed.

'In testimony whereof I have hereunder siwed my name in the presence et" the two subscribed witnesses. A l

. JAMES H. DAVIS.

Witnesses'.

PAUL CARPENTER, Envmm) C. BURNS. 

